Most of the gerrymandering, which gets down to county & municipal levels in some districts, can require popular vote wins on nearly 70% to defeat GOP incumbents.
Vos's district, Assembly 63 is one of those.
https://ballotpedia.org/Wisconsin_State_Assembly_District_63#/media/File:WI_HD_63.JPG
The map shows how they carved out tiny chunks to exclude areas of Racine, Waterford and Burlington. Vos won with a 65% to 35% in 2018. The 63rd had about 29,000 votes in the 2018 election, with Vos = 16,775 votes and Joel Jacobsen with 10,705.
The Dem would need to get an additional 3,000+ votes, compared to the 2018 results.
That is not a lot of votes to swing, plus Joel is running again, so there is some name recognition with a repeat candidacy.
Think... if 250 Dems can each convince a dozen moderate GOPs to vote for Joel, Vos could be defeated.
So talk to friends, neighbors and co-workers to vote for Jacobsen. A good selling point is that every elected official is just a 'temp employee'. Give the Dems a two year try to send a message that gerrymandering is wrong and if the Dems can win back the district, that they will setup a citizen run census based redistricting map for fairer election across the state.
If they are total Trumpies, ask them how many immigrants murdered, raped and took their jobs since 2016? Have the farmers been raped, murdered by the immigrants workers who pick their crops & milk the cows?
If they can't prove those things happened, then ask why the believe that crap and why they are not voting to protect the farms, the kids and themselves....when Trump has not protected anyone, but his own hotels and his own kids.
Ask them what laws Trump has passed that has helped them...as individuals?
Are they better off than four years ago?